/Engine/Source/Runtime/Slate/Public/Widgets/Layout/SRadialBox.h
Removes a slot from this radial box which contains the specifiedSWidgetThe index in the children array where the slot was removed and -1 if no slot was found matching the widget
int32 RemoveSlot ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & SlotWidget )